Brake mechanism



FeB. 7, 1939.

W. C SCHERER BRAKE MECHANISM Filed Feb. 20, 1954 Y llllll lllm mu I Patented Feb ,7, 1939 UNITED STATES PATENT OFFICE.

BRAKE MECHANISM Walter C. Scherer, Rosenburg, Tex., assignor of one-half to A. B. Scgall, Harris County, Tex.

Application February 20,1934, Serial N0. 712,142 1 Claim. (01. ns-152) This inventionrelates to brake mechanism, and has particular relation to that type of brake mechanism specially adapted foruse on motor vehicles.

An object of the invention is to provide auxiliary brakes which will become operative in case the ordinary service brakes fail to operate,

Another object of the invention is to provide, in combination with the hydraulic brake system of a motor vehicle for braking the wheels there- I of, an auxiliary hydraulic brake applicable to the driving shaft of the vehicle and whichwill become operative to brake the vehicle in the event the ordinary brakes fail to operate. With the above and other, objects in view, th

invention hasparticular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in this specification and'illustrated in the accomgo panying drawing, wherein:

Figure '1 shows a fragmentary plan view of a motor vehicle chassis shown partly insection and equipped with the brakes referred to.

Figure 2 shows a cross sectional view of the g5 auxiliary brake housing showing the brake shoes mounted therein, and

Figure 3 shows a side view of the brake pedal and associated parts.

Referring now more "particularly to the draw 40 cludes the cylinder I and the pipirig 8 leads from i this cylinder to the conventional hydraulic brakes 9 of the vehicle wheels. The'cylinder I has the usual plunger which is connected to the brake pedal 6 by the plunger rod Hi. -When the pedal 45 6 is depressed the plunger will apply pressure to the brake fluid in. the cylinder 1, whereby th wheel brakes will be set. i

The drive shaft ll leading from the motor to V the diflerential of the rear axle has the brake l0 drum l2. The .rear side of this drum is closed by a stationary circular plate l3 which is fixed .to the-differential housing II. There are the arcuate brakeshoes l5, is, which are pivoted at one end to the plate l3 and whose other ends are free. Between the free ends of thebrake shoes there is a cylinder l6 having the usual plungers mounted therein which are connected to the free ends of the brake shoes by means of the plunger rods l1, H. The brake shoes l5 are normallv held out of contact with the brakedrum 6 l2 by means of the coil spring l8.

Mounted on the chassis there is the auxiliary cylinder l8 having the plunger therein. A plunger rod 2| is attached to thisplunger andworks loosely through a bearingat one end of 10 the cylinder l9. Leading from the other end of the cylinder l9 there is a tube 22 which is connected into the cylinder I 6 between the plungers thereof. A lever 23 is pivotally mounted on the fulcrum 24 carried by the chassis frame and a link 25 connects the brake pedal 6 with one end of the lever 23. The other end of the lever 23 is opposite the free end of the plunger rod 2|.

During the. normal operation of the regular brake system upon depression of the brake pedal 6, the brakes will be applied to the wheel drums but the lever 23 will not contact with the plunger Should the ordinary wheel. brakes fail to operate, as for example for lack of sufiicient 25 fluid in the cylinder 1, the pedal 6 will be depressed further to its extreme position as illustrated in Figure 3, and the lever 23 will contact with the'plunger rod 2| and place the brake fluid in the cylinder l9 under pressure which will 3 be transmitted to the cylinder l6 and the brake draulic propeller shaft brakes mounted on the I differential housing of the vehicle, a cylinder containing operative fluid, a pipe leading from said cylinder to the propeller shaft brakes, a plunger said brakes. y v

' WALTER c. scrmmm. 

